scholarly journals Comparison of a Countermovement Jump Test and Submaximal Run Test to Quantify the Sensitivity for Detecting Practically Important Changes Within High-Performance Australian Rules Football

2020 ◽  
Vol 15 (1) ◽  
pp. 68-72
Author(s):  
Joel M. Garrett ◽  
Stuart R. Graham ◽  
Roger G. Eston ◽  
Darren J. Burgess ◽  
Lachlan J. Garrett ◽  
...  
Keyword(s):  
High Performance ◽  
Football Players ◽  
Countermovement Jump ◽  
Good Reliability ◽  
Jump Test ◽  
Australian Rules Football ◽  
The Difference ◽  
Test Retest Reliability ◽  
Run Test ◽  
Difference Effect

Purpose: To determine the typical variation of variables from a countermovement jump (CMJ) test and a submaximal run test (SRT), along with comparing the sensitivity of each test for the detection of practically important changes within high-performance Australian rules football players. Methods: A total of 23 professional and semiprofessional Australian rules football players performed 6 CMJs and three 8-second 50-m runs every 30 seconds (SRT), 7 days apart. Absolute and trial-to-trial reliability was represented as a coefficient of variation, CV (±90% confidence intervals). Test–retest reliability was examined using the magnitude of the difference (effect size [±90% confidence interval]) from week 1 to week 2. The smallest worthwhile change was calculated as 0.25 × SD. Results: Good reliability (CVs = 6.6%–9.3%) was determined for all variables except eccentric displacement (CV = 12.8%), with no clear changes observed in any variables between week 1 and week 2. All variables from the SRT possessed a CV less than smallest worthwhile change, indicating an ability to detect practically important changes in performance. Only peak velocity from the CMJ test possessed a CV less than smallest worthwhile change, exhibiting a limitation of this test in detecting practically meaningful changes within this environment. Conclusions: The results suggest that while all variables possess acceptable reliability, a SRT might offer to be a more sensitive monitoring tool than a CMJ test within high-performance Australian rules football, due to its greater ability for detecting practically important changes in performance.

scholarly journals A Novel Method of Assessment for Monitoring Neuromuscular Fatigue in Australian Rules Football Players

2019 ◽  
Vol 14 (5) ◽  
pp. 598-605 ◽  
Author(s):  
Joel Garrett ◽  
Stuart R. Graham ◽  
Roger G. Eston ◽  
Darren J. Burgess ◽  
Lachlan J. Garrett ◽  
...  
Keyword(s):  
High Performance ◽  
Recovery Phase ◽  
Neuromuscular Fatigue ◽  
Football Players ◽  
Alternative Method ◽  
Jump Test ◽  
Australian Rules Football ◽  
Novel Method ◽  
Run Test ◽  
Method Of Assessment

Purpose: To compare the sensitivity of a submaximal run test (SRT) with a countermovement-jump test (CMJ) to provide an alternative method of measuring neuromuscular fatigue (NMF) in high-performance sport. Methods: A total of 23 professional and semiprofessional Australian rules football players performed an SRT and CMJ test prematch and 48 and 96 h postmatch. Variables from accelerometers recorded during the SRT were player load 1D up (vertical vector), player load 1D side (mediolateral vector), and player load 1D forward (anteroposterior vector). Meaningful difference was examined through magnitude-based inferences (effect size [ES]), with reliability assessed as typical error of measurements expressed as coefficient of variance. Results: A small decrease in CMJ height, ES −0.43 ± 0.39 (likely), was observed 48 h postmatch before returning to baseline 96 h postmatch. This was accompanied by corresponding moderate decreases in the SRT variables player load 1D up, ES −0.60 ± 0.51 (likely), and player load 1D side, ES −0.74 ± 0.57 (likely), 48 h postmatch before also returning to prematch baseline. Conclusion: The results suggest that in the presence of NMF, players use an alternative running profile to produce the same external output (ie, time). This indicates that changes in accelerometer variables during an SRT can be used as an alternative method of measuring NMF in high-performance Australian rules football and provides a flexible option for monitoring changes in the recovery phase postmatch.

scholarly journals NORMATIVE BASIS FOR EVALUATION OF COORDINATION ABILITIES OF 9-10 YEAR OLD PUPILS

2019 ◽  
Vol 32 (4) ◽  
pp. 411-416
Author(s):  
Nikolina M. Tankusheva
Keyword(s):  
Primary Schools ◽  
High Performance ◽  
Third Grade ◽  
Motor Abilities ◽  
Jump Test ◽  
The Status ◽  
Long Jump ◽  
Normative Basis ◽  
Primary School Age ◽  
Run Test

Motor abilities, including coordination abilities, represent fundamental prerequisite for future high performance in the field of physical education and sport. In primary school age the foundation is laid for further development of coordination abilities, as well as to acquire knowledge, skills and habits to practice coordination exercises. This 9-10 years old period is called the "golden age" in relation with the pace of development of these abilities.The aim of this research is to establish the actual status of the coordination abilities of the third grade pupils in Bulgaria and draw up a normative table for control and evaluation on its basis. 1073 children, at the age of 9 and 10 years, including 564 boys and 509 girls in third grade, from 13 Bulgarian primary schools have been tested, using the test battery of Hirtz et al. (1985): Тest 1: Backwards ball throw at a target; Test 2: Long jump test (1 м); Test 3: Orientation shuttle run test aiming at numbered targets. To evaluate the status of each of the indicators examined the so-called Six Sigma method was applied and a normative table for the coordination abilities was developed, respectively for boys and girls. The average level of the pupils who participated in the test responds to rating 4.0

scholarly journals Pengaruh Lari Zig Zag dan Side Jump Sprint terhadap Peningkatan Power Pemain Sepak Bola

2020 ◽  
Vol 13 (2) ◽  
pp. 75-84
Author(s):  
Zulfikar H Wada ◽  
Mufa Wibowo
Keyword(s):  
Muscle Power ◽  
Vertical Jump ◽  
Intervention Group ◽  
T Test ◽  
American Football ◽  
Football Players ◽  
Jump Test ◽  
Australian Rules Football ◽  
Leg Muscle ◽  
Leg Muscle Power

Abstrak. Prevalensi terjadinya penurunan power pada otot hamstring menurut American football > 41%, sedangkan di Australian Rules Football terjadi penurunan power hamstring dengan presentase 16% yang angka kejadiannya pada urutan ketiga setelah cedera lutut dan ankle, oleh karena  itu perluya peningkatan power otot tungkai karena mempunyai pengaruh yang sangat penting terhadap performa tim untuk mencapai prestasi sepak bola yang lebih baik. Tujuan penelitian  untuk mengetahui perbedaan pengaruh lari zig zag dengan side jump sprint  terhadap peningkatan power otot tungkai pada pemain sepak bola. Metode penelitian menggunakan desain quasi eksperimental. Sampelnya yaitu Pemain bola di lapangan Nogotirto Yogyakarta yang berusia 17-22 tahun, pengambilan sampel dengan tehnik total sampling, dengan kriteria inklusi dan eksklusi didapatkan 16 orang dan dibagi 2 kelompok sehingga masing-masing 8 orang. Kelompok intervensi 1 dengan lari zig zag dan kelompok intervensi II dengan side jump sprint yang dilakukan selama 4 minggu dengan frekuensi latihan 3 kali seminggu,kemudian diukur dengan vertical jump test. Hasil Uji Paired Sample T-test pada hipotesis I dan II diperoleh nilai p :0,000 (p< 0,05), dan uji beda menggunakan Indevendent Sample T-test diperoleh nilai p :0,633 (p> 0,005). Dapat disimpulkan Tidak ada perbedaan pengaruh latihan lari zig zag dengan latihan side jump sprint terhadap peningkatan power otot tungkai pada pemain sepak bola.  Kata Kunci      : power, zig zag run, side jump sprint, vertical jump  The Influence of Zig Zag Running and Side Jump Sprint on Increasing the Power of Football Players   Abstract. The prevalence of decreasing power in the hamstring muscles according to American football> 41%, while in Australian Rules Football there is a decrease in power hamstring with a percentage of 16% which occurs in third place after knee and ankle injuries, therefore the need to increase leg muscle power because it has a very important influence on team performance to achieve better football performance. The purpose of this study was to determine the differences in the effect of zig zag running with side jump sprint on increasing leg muscle power in football players. The research method use quasi experimental design. The sample is football players in Yogyakarta Nogotirto field aged 17-22 years, taking the sampling with total sampling techniques, with inclusion and exclusion criteria found 16 people and divided into 2 groups so that each 8 people. Intervention group 1 with zig zag running and intervention group II with side jump sprint conducted for 4 weeks with exercise frequency 3 times a week, then measured by vertical jump test. The results of the Paired Sample T-test in hypotheses I and II obtained p values: 0,000 (p <0.05), and different tests using the Independent Sample T test obtained p values: 0.633 (p> 0.005). It can be concluded that there is no difference in the effect of zig zag running exercises with side jump sprint exercises on increasing leg muscle power in football players.   Keywords: power, zig zag run, side jump sprint, vertical jumps

Critical Success Factors of High Performance Work System (HPWS) Practices: Findings from Malaysian SMEs

2020 ◽  
Vol 11 (1) ◽  
pp. 162-162
Author(s):  
Noor Hassanah Husin ◽  
Nur Naha Abu Mansur ◽  
Nur Naha Abu Mansur ◽  
Beni Widarman Yus Kelana
Keyword(s):  
High Performance ◽  
Manufacturing Industry ◽  
Small And Medium Enterprises ◽  
Success Factor ◽  
Good Reliability ◽  
Work System ◽  
Critical Success ◽  
Innovative Work ◽  
High Performance Work System ◽  
Medium Enterprises

Innovation plays a major role and is a crucial component of the organization’s growth. Creativity and innovation have become increasingly popular as key contributors to firm success in the last few decades or so. The incoming technology of Industrial Revolution 4.0 forced many companies to be innovative to compete in technological era. However, many SMEs are not ready and less innovative. Furthermore, there is lack of research focus on HPWS implementation amongst SMEs indicates that further research must be conducted along these lines. Therefore, this study aim to investigate the effect of high performance work system (HPWS) towards innovative work behaviour of employees in small and medium enterprises. This study used quantitative approach to identify the critical success factor of high performance work systems (HPWS) in Malaysian small and medium enterprises (SME) manufacturing industry. This study used descriptive analysis to analyze the data. Five-point Likert scales items ranging from (1-strongly disagree, 5 – strongly agree) employed for measuring the HPWS. Therefore, the total of 81 items survey questions were adapted to obtain the respondents for SME manufacturing industry. Reliability analysis shows that all the HPWS dimensions have very good reliability with Cronbach’s alpha value range from 0.884 to 0.976. According to Tang et al (2014), Cronbach’s alpha range between 0.70 and 0.80 considered as good reliability whereby 0.80 and 0.90 considered as very good reliability. Result also showed that selective staffing has the highest mean score followed by employee participation, which are 3.951 and 3.833 respectively. This proved that selective staffing is most important critical success factor in the HPWS implementation for Malaysian SME manufacturing industry. Keywords: high performance work system, work engagement, innovative work behaviour, small and medium enterprise.

The Big Five Inventory–2 in China: A Comprehensive Psychometric Evaluation in Four Diverse Samples

Assessment ◽  
2021 ◽  
pp. 107319112110082
Author(s):  
Bo Zhang ◽  
Yi Ming Li ◽  
Jian Li ◽  
Jing Luo ◽  
Yonghao Ye ◽  
...  
Keyword(s):  
Big Five ◽  
Discriminant Validity ◽  
Psychometric Evaluation ◽  
Good Reliability ◽  
Future Directions ◽  
Big Five Inventory ◽  
Education Levels ◽  
Lower Education ◽  
Content Coverage ◽  
Test Retest Reliability

The Big Five Inventory-2 (BFI-2) has received wide recognition since its publication because it strikes a good balance between content coverage and brevity. The current study translated the BFI-2 into Chinese, evaluated its psychometric properties in four diverse Chinese samples (college students, adult employees, adults treated for substance use, and adolescents), and compared its factor structure with those obtained from two U.S. samples. Across two studies, the Chinese BFI-2 demonstrated good reliability (Cronbach’s α and test–retest reliability), structural validity, convergent/discriminant validity, and criterion-related validity at the domain level. At lower levels of analyses, some facets and negatively worded items functioned better among participants with higher than those with lower education levels. Implications, limitations, and future directions are discussed.

scholarly journals The Mechanical Properties and Damage Evolution of UHPC Reinforced with Glass Fibers and High-Performance Polypropylene Fibers

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2455
Author(s):  
Jiayuan He ◽  
Weizhen Chen ◽  
Boshan Zhang ◽  
Jiangjiang Yu ◽  
Hang Liu
Keyword(s):  
Mechanical Properties ◽  
Glass Fiber ◽  
Damage Evolution ◽  
High Performance ◽  
High Performance Concrete ◽  
Glass Fibers ◽  
Ultra High Performance Concrete ◽  
Concrete Damaged Plasticity ◽  
The Difference ◽  
Experimental Values

Due to the sharp and corrosion-prone features of steel fibers, there is a demand for ultra-high-performance concrete (UHPC) reinforced with nonmetallic fibers. In this paper, glass fiber (GF) and the high-performance polypropylene (HPP) fiber were selected to prepare UHPC, and the effects of different fibers on the compressive, tensile and bending properties of UHPC were investigated, experimentally and numerically. Then, the damage evolution of UHPC was further studied numerically, adopting the concrete damaged plasticity (CDP) model. The difference between the simulation values and experimental values was within 5.0%, verifying the reliability of the numerical model. The results indicate that 2.0% fiber content in UHPC provides better mechanical properties. In addition, the glass fiber was more significant in strengthening the effect. Compared with HPP-UHPC, the compressive, tensile and flexural strength of GF-UHPC increased by about 20%, 30% and 40%, respectively. However, the flexural toughness indexes I5, I10 and I20 of HPP-UHPC were about 1.2, 2.0 and 3.8 times those of GF-UHPC, respectively, showing that the toughening effect of the HPP fiber is better.

scholarly journals A Modified KNN Algorithm for High-Performance Computing on FPGA of Real-Time m-QAM Demodulators

Electronics ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 627
Author(s):  
David Marquez-Viloria ◽  
Luis Castano-Londono ◽  
Neil Guerrero-Gonzalez
Keyword(s):  
Real Time ◽  
High Performance ◽  
Interference Mitigation ◽  
Parallel Implementation ◽  
Computational Time ◽  
Successful Implementation ◽  
Interchannel Interference ◽  
The Difference ◽  
High Level ◽  
Performance Computing

A methodology for scalable and concurrent real-time implementation of highly recurrent algorithms is presented and experimentally validated using the AWS-FPGA. This paper presents a parallel implementation of a KNN algorithm focused on the m-QAM demodulators using high-level synthesis for fast prototyping, parameterization, and scalability of the design. The proposed design shows the successful implementation of the KNN algorithm for interchannel interference mitigation in a 3 × 16 Gbaud 16-QAM Nyquist WDM system. Additionally, we present a modified version of the KNN algorithm in which comparisons among data symbols are reduced by identifying the closest neighbor using the rule of the 8-connected clusters used for image processing. Real-time implementation of the modified KNN on a Xilinx Virtex UltraScale+ VU9P AWS-FPGA board was compared with the results obtained in previous work using the same data from the same experimental setup but offline DSP using Matlab. The results show that the difference is negligible below FEC limit. Additionally, the modified KNN shows a reduction of operations from 43 percent to 75 percent, depending on the symbol’s position in the constellation, achieving a reduction 47.25% reduction in total computational time for 100 K input symbols processed on 20 parallel cores compared to the KNN algorithm.

A new visual feedback-based system for the assessment of pinch force, endurance, accuracy and precision. A test-retest reliability study

Hand Therapy ◽  
2021 ◽  
pp. 175899832110025
Author(s):  
Alberto Dottor ◽  
Eleonora Camerone ◽  
Mirko Job ◽  
Diletta Barbiani ◽  
Elisa Frisaldi ◽  
...  
Keyword(s):  
Visual Feedback ◽  
Intraclass Correlation ◽  
Precision Grip ◽  
Voluntary Contraction ◽  
Good Reliability ◽  
Retest Reliability ◽  
Relative Reliability ◽  
Time Accuracy ◽  
In The Beginning ◽  
Test Retest Reliability

Introduction Given that pinch is a precision grip involved in sustained submaximal activities, a Sustained Contraction (SC) task could be associated to Maximal Voluntary Contraction (MVC). To better evaluate the thumb-index system, the test-retest reliability of pinch MVC and SC, measured by a visual feedback-based pinch gauge was assessed. Methods 26 healthy participants performed MVC and SC in two separate sessions. SC required to maintain 40%MVC as long as possible and it was evaluated in terms of time, accuracy (Mean Distance between force trace and target force, MD), precision (Coefficient of Variability of force trace, CV). MD and CV analyses were conducted dividing the SC task into three equivalent time stages (beginning, middle, exhaustion). Relative Reliability (RR) was measured by Intraclass Correlation Coefficient, and Absolute Reliability (AR) was measured by Standard Error of Measurement and by Bland-Altman plot. Results MVC and Time showed high RR and AR in both hands. RR of MD and CV in right hand was excellent in the beginning and middle stages, and fair in the exhaustion one, showing decreasing reliability as fatigue increases. In the left hand RR of MD and CV was generally lower. MD showed excellent reliability in the beginning stage and good reliability in the other stages. CV showed fair relative reliability at both beginning and middle stages, excellent in the last one. Conversely, it was observed high AR of MD and CV in all stages in both hands. Conclusions All indices are reliable to assess motor control of thumb-index pinch in both hands.

Test–Retest Reliability of the Twin Cities Walking Survey

2009 ◽  
Vol 6 (1) ◽  
pp. 119-131 ◽  
Author(s):  
Ann Forsyth ◽  
J. Michael Oakes ◽  
Kathryn H. Schmitz
Keyword(s):  
Physical Activity ◽  
International Physical Activity Questionnaire ◽  
Total Activity ◽  
Twin Cities ◽  
Kappa Statistics ◽  
Good Reliability ◽  
Retest Reliability ◽  
Social Features ◽  
Test Retest Reliability ◽  
Activity Questionnaire

Background:The Twin Cities Walking Study measured the associations of built environment versus socioeconomic and psychosocial variables with total physical activity and walking for 716 adults.Methods:This article reports on the test–retest reliability of the survey portion of the study. To test the reliability of the study measures, 158 respondents completed measures twice within 1 to 4 weeks. Agreement between participants’ responses was measured using Pearson r and Spearman rho, and kappa statistics.Results:Demographic questions are highly reliable (R > .8). Questions about environmental and social features are typically less reliable (rho range = 0.42– 0.91). Reliability of the International Physical Activity Questionnaire (last 7 days version) was low (rho = 0.15 for total activity).Conclusions:Much of the survey has acceptable-to-good reliability. The low test–retest reliability points to potential limitations of using a single administration of the IPAQ to characterize habitual physical activity. Implications for sound inference are accordingly complicated.

scholarly journals Fast Comparison of High-Precision Time Scales Using GNSS Receivers

2017 ◽  
Vol 2017 ◽  
pp. 1-4
Author(s):  
Vojtech Vigner ◽  
Jaroslav Roztocil
Keyword(s):  
Time Scales ◽  
Time Scale ◽  
High Performance ◽  
Data Format ◽  
Common View ◽  
Log Files ◽  
Gnss Receivers ◽  
Precision Time ◽  
The Common ◽  
The Difference

Comparison of high-performance time scales generated by atomic clocks in laboratories of time and frequency metrology is usually performed by means of the Common View method. Laboratories are equipped with specialized GNSS receivers which measure the difference between a local time scale and a time scale of the selected satellite. Every receiver generates log files in CGGTTS data format to record measured differences. In order to calculate time differences recorded by two receivers, it is necessary to obtain these logs from both receivers and process them. This paper deals with automation and speeding up of these processes.

Sign in / Sign up

Export Citation Format

Share Document